Free & Cheap London Events: 18-24 March 2013

FREE WALKS: To celebrate English Tourism Week, there are daily free walks on varying topics all week, courtesy of the fine people at City Guides. Scroll down to the bottom of this website for details of what, where and when.

SIR CHRISTOPHER WREN: Join Tony Tucker at the Guildhall Library as he takes you through the life and works of Wren, with particular focus on his City Churches. Free, just turn up, 2pm (early arrival recommended)

SAVING THE SARK: Chief Executive of the Cutty Sark Trust, Richard Doughty, discusses the inspirations, risks and technical difficulties behind one of the most complex maritime projects ever undertaken. At the Novotel, Hammersmith. Free, prebook, 7pm

FASCINATING FACES: Danny Rees leads this event at the Wellcome Collection, where archives, art and illustrated texts are brought together to reveal what our faces reveal about us. Free, pick up tickets from 1.30pm on the day, event starts 3pm

NEW WORLD: Synthetic Biology may not always be at the forefront of your mind, but it touches on every aspect of our lives. Meet the researchers at the forefront of this new world at Imperial College London, and take part in activities that will challenge your conception of life as you know it. Free, just turn up, 5.30pm

KARAUKE: Ever wanted to take part in a karaoke evening, but lamented the noticeable lack of ukeleles? Karauke is the answer to your problems - tonight's event is at The Royal George on Charing Cross Road. Free, just turn up, 7pm

Friday 22 March

LOCO FOR COCO: The Chocolate Festival is returning to the Southbank Centre from today for its 10th year of chocolatey deliciousness. You can create your own chocolate bar, try chilli chocolate, learn how to stuff chocolate and much more. Free, just turn up, until 24 March

Saturday 23 March

CLASSIC SCOOTERS: Hundreds of classic bikes are rolling into the Old Royal Naval College in Greenwich today, which bike-lovers are free to go and admire. Free, just turn up, 12.30pm

Sunday 24 March

FROGS: Head to the Centre for Wildlife Gardening today and learn all about frogs at this fun family event, with pond-dipping, face painting, arts and crafts, games and an educational area. There is tea and cake for grown-ups (and maybe well behaved children). Free, just turn up, 10am

EASTER MARKET: The Crafty Fox Market is doing an Easter special this weekend at The Dogstar in Brixton, where you can browse, chat and enjoy the live DJ. Each day the market sees a whole new host of designers setting up stall, and Sunday's line-up looks great. Free, just turn up, 11am